Nanofiltration (NF) is a membrane liquid-separation technique that has many properties with reverse osmosis (RO). Unlike RO, which rejects almost all dissolved solutes, NF rejects multivalent ions such as calcium while rejecting monovalent ions such as chloride.
At HID membraanes we provides a line of nanofiltration (NF) membranes that are developed to give optimal flux and rejection and may be modified to meet the specific needs of various process applications. Our nanofiltration membranes, which are available in spiral-wound and flat sheet membrane topologies, may reject multivalent salts and bigger molecules while selectively rejecting changing levels of monovalent salts.
The separation technique of nanofiltration is characterized by organic, thin-film composite membranes with pore sizes ranging from 0.1 to 10nm. NF membranes, unlike reverse osmosis (RO) membranes, may function at lower pressures and allow selective solute rejection based on both size and charge.
Our nanofiltration membranes, with pore sizes ranging from 0.1 to 10nm, allow water and certain salts to flow through while keeping multivalent ions, low molecular weight molecules, carbohydrates, proteins, and other organic substances. HID’s NFS, NFX, NFW, and NFG nanofiltration membrane products have been demonstrated to offer excellent fouling resistance, high selectivity, and the physical durability required for use in a wide range of industrial separation processes after years of research and development.
MgSO4 and lactose rejection are good in NFS, NFX, and NFW, whereas NFG partly eliminates monosaccharides from oligosaccharides. Nanofiltration membranes may also significantly reduce hardness, nitrates, sulfates, tannins, turbidity, color, TDS, and mild salt levels in feed water streams.
Nanofiltration membranes are a relatively new discovery that provides better ion selectivity than reverse osmosis membranes, which reject all ion species in a feed stream. This distinct feature allows for greater flexibility in separation process development, which can have a significant influence on performance and economics, particularly in industrial applications. Here are a few examples of how our NF membrane technology is used:
- Lactose and whey demineralization in dairy processing
- Lactose and whey concentration
- Removal of natural organic matter in water and wastewater treatment
- Reduction of hardness in water purification
- Sulfate removal from seawater and chemical processes
- Desalting of process streams in various industries
Post time: Jun-12-2022